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Investment Objective 
The Fund seeks to provide long-term growth of capital primarily through

investment in equity securities. Current income is a secondary objective.
Expenses and Fees 
This table describes the fees and expenses that you may pay if you buy and hold

Institutional Class shares of the Fund.
Shareholder Fees (fees paid directly from your investment)
Shareholder Fees
ROBECO BP SMALL CAP VALUE II
INSTITUTIONAL
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) none
Maximum deferred sales charge (load) none
Maximum sales charge (load) imposed on reinvested dividends none
Redemption fee (as a percentage of amount redeemed on shares held for less than 60 days, if applicable) 1.00%
Exchange fee (as a percentage of amount exchanged on shares held for less than 60 days, if applicable) 1.00%
Annual Fund Operating Expenses* (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses
ROBECO BP SMALL CAP VALUE II
INSTITUTIONAL
Management fees 1.00%
Distribution (12b-1) fees none
Other expenses 0.37%
Total annual Fund operating expenses 1.37%
Fee waivers and expense reimbursements [1] (0.07%)
Net expenses 1.30%
[1] The Fund's investment adviser, Robeco Investment Management, Inc. ("Robeco"), has contractually agreed to waive all or a portion of its advisory fee and/or reimburse expenses in an aggregate amount equal to the amount by which the Total Annual Fund Operating Expenses (excluding certain items discussed below) for the Fund's Institutional Class shares exceeds 1.30% of the average daily net assets attributable to the Fund's Institutional Class shares. In determining Robeco's obligation to waive advisory fees and/or reimburse expenses, the following expenses are not taken into account and could cause net Total Annual Fund Operating Expenses to exceed 1.30%: acquired fund fees and expenses, short sale dividend expenses, brokerage commissions, extraordinary items, interest or taxes. This contractual limitation is in effect until December 31, 2012 and may not be terminated without the approval of the Board of Directors of The RBB Fund, Inc. Robeco may not recoup any of its waived investment advisory fees.
Example 
This Example is intended to help you compare the cost of investing in the Fund

with the cost of investing in other mutual funds. The Example assumes that you

invest $10,000 in the Fund for the time periods indicated and that you sell all

of your shares at the end of the period. The Example also assumes that your

investment has a 5% return each year and that the operating expenses of the Fund

remain the same. Although your actual costs may be higher or lower, based on

these assumptions your costs would be:
Expense Example (USD $)
Expense Example, With Redemption, 1 Year
Expense Example, With Redemption, 3 Years
Expense Example, With Redemption, 5 Years
Expense Example, With Redemption, 10 Years
ROBECO BP SMALL CAP VALUE II INSTITUTIONAL
 132 427 743 1,640
Portfolio Turnover 
The Fund pays transaction costs, such as commissions, when it buys and sells

securities (or "turns over" its portfolio). A higher portfolio turnover rate may

indicate higher transaction costs and may result in higher taxes when Fund

shares are held in a taxable account. These costs, which are not reflected in

Total Annual Fund Operating Expenses or in the Example, affect the Fund's

performance. During the fiscal year ended August 31, 2011, the portfolio

turnover rate for the Fund was 38%.
Summary of Principal Investment Strategies 
The Fund pursues its objective by investing, under normal circumstances, at

least 80% of its net assets (including borrowings for investment purposes) in a

diversified portfolio consisting primarily of equity securities, such as common

stocks of issuers with small market capitalizations and identified by Robeco as

having value characteristics. A small market capitalization issuer generally is

considered to be one whose market capitalization is, at the time the Fund makes

the investment, similar to the market capitalization of companies in the Russell

2000® Value Index. The Russell 2000® Value Index is an unmanaged index that

contains stocks from the Russell 2000® Index with less than average growth

orientation. As of November 30, 2011, the median market capitalization of this

index was $370 million and the largest stock was $3.7 billion. Please note that

this range is as of a particular point in time and is subject to change.



The Fund generally invests in the equity securities of small companies. Robeco

will seek to invest in companies it considers to be well managed and to have

attractive fundamental financial characteristics. Robeco believes greater

potential for price appreciation exists among small companies since they tend to

be less widely followed by other securities analysts and thus may be more likely

to be undervalued by the market. The Fund may invest from time to time a portion

of its assets, not to exceed 20% (under normal conditions) at the time of

purchase, in companies with larger market capitalizations.



Robeco examines various factors in determining the value characteristics of such

issuers including price to book value ratios and price to earnings ratios. These

value characteristics are examined in the context of the issuer's operating and

financial fundamentals such as return on equity, earnings growth and cash flow.

Robeco selects securities for the Fund based on a continuous study of trends in

industries and companies, earnings power and growth and other investment

criteria.



The Fund may also invest up to 25% of its total assets in non U.S.

dollar-denominated securities.



The Fund may invest up to 15% of its net assets in illiquid securities,

including securities that are illiquid by virtue of the absence of a readily

available market or legal or contractual restrictions on resale.



The Fund may participate as a purchaser in initial public offerings of

securities ("IPO"). An IPO is a company's first offering of stock to the public.



In general, the Fund's investments are broadly diversified over a number of

industries and, as a matter of policy, the Fund is limited to investing a

maximum of 25% of its total assets in any one industry.



While Robeco intends to fully invest the Fund's assets at all times in

accordance with the above-mentioned policies, the Fund reserves the right to

hold up to 100% of its assets, as a temporary defensive measure, in cash and

eligible U.S. dollar-denominated money market instruments. Robeco will determine

when market conditions warrant temporary defensive measures.
Summary of Principal Risks 
o Management Risk. The Fund is subject to the risk of poor stock selection. In

other words, the individual stocks in the Fund may not perform as well as

expected, and/or the Fund's portfolio management practices do not work to

achieve their desired result.



o Market Risk. The net asset value ("NAV") of the Fund will change with changes

in the market value of its portfolio positions. Investors may lose money.

Although the Fund will invest in stocks Robeco believes to be undervalued, there

is no guarantee that the prices of these stocks will not move even lower.



o Foreign Securities Risk. International investing is subject to special risks,

including, but not limited to, currency exchange rate volatility, political,

social or economic instability, and differences in taxation, auditing and other

financial practices.



o Small Cap Companies Risk. The Fund will invest in smaller issuers which are

more volatile and less liquid than investments in issuers with a market

capitalization greater than the market capitalization of companies in the

Russell 2000® Value Index. Small market capitalization issuers are not as

diversified in their business activities as issuers with market capitalizations

greater than the market capitalization of companies in the Russell 2000® Value

Index and are more susceptible to changes in the business cycle.



The small capitalization equity securities in which the Fund invests may be

traded only in the over-the-counter market or on a regional securities exchange,

may be listed only in the quotation service commonly known as the "pink sheets,"

and may not be traded every day or in the volume typical of trading on a

national securities exchange. These securities may also be subject to wide

fluctuations in market value. The trading market for any given small

capitalization equity security may be sufficiently small as to make it difficult

for the Fund to dispose of a substantial block of such securities. The sale by

the Fund of portfolio securities to meet redemptions may require the Fund to

sell its small capitalization securities at a discount from market prices or

during periods when, in Robeco's judgment, such sale is not desirable. Moreover,

the lack of an efficient market for these securities may make them difficult to

value.



o Portfolio Turnover Risk. If the Fund frequently trades its portfolio

securities, the Fund will incur higher brokerage commissions and transaction

costs, which could lower the Fund's performance. In addition to lower

performance, high portfolio turnover could result in taxable capital gains. The

annual portfolio turnover rate for the Fund is not expected to exceed 175%;

however, it may be higher if Robeco believes it will improve the Fund's

performance.



o Illiquid Securities Risk. Investing in illiquid securities is subject to

certain risks, such as limitations on resale and uncertainty in determining

valuation. Limitations on resale may adversely affect the marketability of

portfolio securities and the Fund might be unable to dispose of restricted or

other illiquid securities promptly or at reasonable prices and might thereby

experience difficulty satisfying redemptions within seven days. The Fund might,

in order to dispose of restricted securities, have to register securities

resulting in additional expense and delay. Adverse market conditions could

impede such a public offering of such securities.



o IPO Risk. IPO risk is the risk that the market value of IPO shares will

fluctuate considerably due to certain factors, such as the absence of a prior

public market, unseasoned trading, the small number of shares available for

trading and limited information about the issuer. The purchase of IPO shares may

involve high transaction costs. IPO shares are subject to market risk and

liquidity risk. When the Fund's asset base is small, a significant portion of

the Fund's performance could be attributable to investments in IPOs, because

such investments would have a magnified impact on the Fund. As the Fund's assets

grow, the effect of the Fund's investments in IPOs on the Fund's performance

probably will decline, which could reduce the Fund's performance. Because of the

price volatility of IPO shares, the Fund may choose to hold IPO shares for a

very short period of time. This may increase the turnover of the Fund's

portfolio and may lead to increased expenses to the Fund, such as commissions

and transaction costs. In addition, Robeco cannot guarantee continued access to

IPOs.
Performance Information 
The chart below illustrates the long-term performance of the Robeco Boston

Partners Small Cap Value Fund II's Institutional Class. The information shows

you how the Fund's performance has varied year by year and provides some

indication of the risks of investing in the Fund. The chart assumes reinvestment

of dividends and distributions. As with all such investments, past performance

(before and after taxes) is not an indication of future results. Performance

reflects fee waivers in effect. If fee waivers were not in place, the Fund's

performance would be reduced. Updated performance information is available at

www.robecoinvest.com or 1-888-261-4073.
Total Returns for the Calendar Years Ended December 31
Bar Chart 
Best and Worst Quarterly Performance (for the periods reflected in the chart

above):



Best Quarter: 29.32% (quarter ended June 30, 2009)



Worst Quarter: (26.32)% (quarter ended December 31, 2008)



Year-to-date total return for the nine months ended September 30, 2011: (15.68)%
Average Annual Total Returns 
The table below compares the average annual total returns for the Fund's

Institutional Class both before and after taxes for the past calendar year,

past five calendar years and past ten calendar years to the average annual

total returns of a broad-based securities market index for the same periods.
Average Annual Total Returns for the Periods Ended December 31, 2010
Average Annual Total Returns ROBECO BP SMALL CAP VALUE II
Average Annual Returns, Label
Average Annual Returns, 1 Year
Average Annual Returns, 5 Years
Average Annual Returns, 10 Years
INSTITUTIONAL
 Returns Before Taxes 18.50% 4.44% 11.57%
INSTITUTIONAL After Taxes on Distributions
 Returns After Taxes on Distributions [1] 18.37% 2.39% 9.88%
INSTITUTIONAL After Taxes on Distributions and Sales
 Returns After Taxes on Distributions and Sale of Fund Shares 12.02% 3.38% 9.91%
Russell 2000® Value Index
 Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes) [2] 24.50% 3.52% 8.42%
[1] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
[2] The Russell 2000® Value Index is an unmanaged index that contains stocks from the Russell 2000® Index with less than average growth orientation. Companies in this index generally have low price-to-book and price-to-earnings ratios, higher dividend yields and lower forecasted growth values. As of November 30, 2011, the median market capitalization of the companies in the Russell 2000® Value Index is $370 million and the largest stock is $3.7 billion. Please note that this range is as of a particular point in time and is subject to change. The Russell 2000® Value Index is a registered trademark of the Frank Russell Corporation.
INSTITUTIONAL
SUMMARY SECTION